use code cli for token and update readme

Author: f0ssel

github-upload-public-key/README.md

@@ -3,13 +3,13 @@ display_name: Github Upload Public Key
 description: Automates uploading Coder public key to Github so users don't have to.
 icon: ../.icons/github.svg
 maintainer_github: f0ssel
-verified: false
-tags: [helper]
+verified: true
+tags: [helper, git]
 ---
 
 # github-upload-public-key
 
-<!-- Describes what this module does -->
+Templates that utilize Github External Auth can automatically ensure that the Coder public key is uploaded to Github so that users can clone repositories without needing to upload the public key themselves.
 
 ```tf
 module "github-upload-public-key" {
@@ -19,5 +19,16 @@ module "github-upload-public-key" {
 }
 ```
 
-<!-- Add a screencast or screenshot here  put them in .images directory -->
-<!-- TODO: Add examples -->
+# Requirements
+
+Github External Auth must be enabled in the workspace for this module to work. The Github app that is configured for external auth must have both read and write permissions to "Git SSH keys" in order to upload the public key. Additionally, a Coder admin must also have the `admin:public_key` scope added to the external auth configuration of the Coder deployment. For example:
+
+```
+CODER_EXTERNAL_AUTH_0_ID="USER_DEFINED_ID"
+CODER_EXTERNAL_AUTH_0_TYPE=github
+CODER_EXTERNAL_AUTH_0_CLIENT_ID=xxxxxx
+CODER_EXTERNAL_AUTH_0_CLIENT_SECRET=xxxxxxx
+CODER_EXTERNAL_AUTH_0_SCOPES="repo,workflow,admin:public_key"
+```
+
+Note that the default scopes if not provided are `repo,workflow`.

github-upload-public-key/run.sh

@@ -15,11 +15,17 @@ if [ -z "$CODER_OWNER_SESSION_TOKEN" ]; then
   exit 1
 fi
 
+echo "Fetching GitHub token..."
+GITHUB_TOKEN=$(coder external-auth access-token github)
+if [ $? -ne 0 ]; then
+  echo "Failed to fetch GitHub token!"
+  exit 1
+fi
 if [ -z "$GITHUB_TOKEN" ]; then
-  echo "No GITHUB_TOKEN in the workspace environment!"
-  echo "The user must be authenticated with Github before this script can be run."
+  echo "No GitHub token found!"
   exit 1
 fi
+echo "GitHub token found!"
 
 echo "Fetching Coder public SSH key..."
 PUBLIC_KEY_RESPONSE=$(curl -L -s \